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Which of the Alkali Metal is Having Least Melting Point? - Chemistry

Question

Which of the alkali metal is having least melting point?

(a) Na

(b) K

(c) Rb

(d) Cs

Solution 1

Atomic size increases as we move down the alkali group. As a result, the binding energies of their atoms in the crystal lattice decrease. Also, the strength of metallic bonds decreases on moving down a group in the periodic table. This causes a decrease in the melting point. Among the given metals, Cs is the largest and has the least melting point.

Solution 2

Size of Cs is the biggest thus, its melting point is the lowest, (d) is correct.

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 NCERT Solution for Chemistry Textbook for Class 11 (2018 (Latest))
Chapter 10: The s-Block Elements
| Q 30 | Page 306
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Which of the Alkali Metal is Having Least Melting Point? Concept: Group 1 Elements - Alkali Metals.
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